import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/login.vue'
import Home from '../components/home.vue'
import Welcome from '../components/welcome.vue'
import Users from '../components/user/Users.vue'
import Rights from '../components/power/rights.vue'
import Roles from '../components/power/roles.vue'
import Cate from '../components/goods/cate.vue'
import Params from '../components/goods/params.vue'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [
      {
        path: '/welcome',
        component: Welcome
      },
      {
        path: '/users',
        component: Users
      },
      {
        path: '/rights',
        component: Rights
      },
      {
        path: '/roles',
        component: Roles
      },
      {
        path: '/categories',
        component: Cate
      },
      {
        path: '/params',
        component: Params
      }
    ]
  }
]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to: 将要访问的路径
  // from: 从哪个路径跳转而来
  // next： 是一个函数，表示放行(next() 放行    next('./login) 强制跳转)

  // 如果是请求login页面，放行
  if (to.path === '/login') {
    return next()
  }
  // 获取token值
  const tokenStr = window.sessionStorage.getItem('token')
  // 判断是否有token值，没有则强制跳转
  if (!tokenStr) {
    return next('/login')
  }
  // 有token值，放行
  next()
})

export default router
